如何通过其他函数调用函数内容？

def func1():
    print("Hello, World!")

def func2(callback):
    callback()

func2(func1)  # 输出：Hello, World!

def outer_func():
    def inner_func():
        print("Hello, World!")
    return inner_func

func = outer_func()
func()  # 输出：Hello, World!

def decorator(func):
    def wrapper():
        print("Before function call")
        func()
        print("After function call")
    return wrapper

@decorator
def func():
    print("Hello, World!")

func()  # 输出：
# Before function call
# Hello, World!
# After function call